a. The addition of 1 equivalent of bromine at room temperature to the phellandrenes will give three possible di-brominated products. Select either a- or B-phellandrene for this question and draw it in the left box - you can answer this question with either isomer. Draw all three products in the colored boxes depicted - you do not need to depict newly formed stereocenters or show mechanisms. OR a-phellandrene B-phellandrene select either a- or B-phellandrene Br₂ room temperature 3 possible products (see below)
Reactive Intermediates
In chemistry, reactive intermediates are termed as short-lived, highly reactive atoms with high energy. They rapidly transform into stable particles during a chemical reaction. In specific cases, by means of matrix isolation and at low-temperature reactive intermediates can be isolated.
Hydride Shift
A hydride shift is a rearrangement of a hydrogen atom in a carbocation that occurs to make the molecule more stable. In organic chemistry, rearrangement of the carbocation is very easily seen. This rearrangement can be because of the movement of a carbocation to attain stability in the compound. Such structural reorganization movement is called a shift within molecules. After the shifting of carbocation over the different carbon then they form structural isomers of the previous existing molecule.
Vinylic Carbocation
A carbocation where the positive charge is on the alkene carbon is known as the vinyl carbocation or vinyl cation. The empirical formula for vinyl cation is C2H3+. In the vinyl carbocation, the positive charge is on the carbon atom with the double bond therefore it is sp hybridized. It is known to be a part of various reactions, for example, electrophilic addition of alkynes and solvolysis as well. It plays the role of a reactive intermediate in these reactions.
Cycloheptatrienyl Cation
It is an aromatic carbocation having a general formula, [C7 H7]+. It is also known as the aromatic tropylium ion. Its name is derived from the molecule tropine, which is a seven membered carbon atom ring. Cycloheptatriene or tropylidene was first synthesized from tropine.
Stability of Vinyl Carbocation
Carbocations are positively charged carbon atoms. It is also known as a carbonium ion.
![**α-phellandrene and β-phellandrene**
**Description:**
α-phellandrene and β-phellandrene are two isomeric diene-containing terpene compounds isolated from eucalyptus plants that are used in fragrances due to their minty and citrusy odors. Use these two compounds to answer the following two questions:
**Question a:**
The addition of 1 equivalent of bromine at room temperature to the phellandrenes will give three possible di-brominated products. Select either α- or β-phellandrene for this question and draw it in the left box – you can answer this question with either isomer. Draw all three products in the colored boxes depicted – you do not need to depict newly formed stereocenters or show mechanisms.
**Diagram:**
- Two molecular structures are shown:
- α-phellandrene
- β-phellandrene
(Note: These are chemical structures, with α-phellandrene and β-phellandrene illustrated as hexagonal rings with varying double bonds and substituent methyl groups.)
- Beside these structures:
- A blank box is labeled "select either α- or β-phellandrene."
- Following the blank box:
- A reaction arrow labeled "Br₂ / room temperature" points towards three separate blank boxes.
- Under these boxes:
- The three blank boxes are labeled as "product 1", "product 2", and "product 3" respectively, in blue, red, and gray outlines.
In completing the exercise, students are prompted to select either α- or β-phellandrene, draw the chosen structure in the indicated box, and then predict and depict the three possible di-brominated products in the colored boxes below. Students are not required to show the stereocenters or mechanisms in their drawings.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Feb2e2013-15d0-4e81-b731-8816ed407a57%2F0300ab52-be2c-41db-b33e-6a5191077ec9%2F80tsiud_processed.png&w=3840&q=75)
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